EP1962434B1 - Appareil de réception, appareil de détection de trajet, procédé associé, et programme utilisé dans une station de base - Google Patents

Appareil de réception, appareil de détection de trajet, procédé associé, et programme utilisé dans une station de base Download PDF

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Publication number
EP1962434B1
EP1962434B1 EP20080101954 EP08101954A EP1962434B1 EP 1962434 B1 EP1962434 B1 EP 1962434B1 EP 20080101954 EP20080101954 EP 20080101954 EP 08101954 A EP08101954 A EP 08101954A EP 1962434 B1 EP1962434 B1 EP 1962434B1
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EP
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Prior art keywords
user equipment
evaluation value
scheduling
judgment criteria
user
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EP20080101954
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German (de)
English (en)
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EP1962434A1 (fr
Inventor
Takato Ezaki
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Fujitsu Ltd
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Fujitsu Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707—Efficiency-related aspects

Definitions

  • the embodiments generally relates to the technical field of wireless communication, and more particularly relates to a reception apparatus, path detection apparatus, method thereof, and program used in a base station of a wireless communication system, particularly but not necessarily exclusively a Code Division Multiple Access (CDMA) system base station.
  • CDMA Code Division Multiple Access
  • the transmission signal is encoded as error correcting code and data modulated, and is then spread by a spreading code sequence and transmitted wirelessly.
  • the transmission signal propagates through a broad-band wireless link to the receiving party the signal is affected by planimetrical (topographical) features or buildings.
  • the signal is despread, is divided into one or more multipath components, then these components are Rake combined.
  • the Rake combined signal is data demodulated, the error correcting code is decoded, then the transmission signal is restored.
  • the path timing which is the time at which each of the one or more multipath components reaches a receiver, differs depending on the condition of the wireless link.
  • BTS Base Transceiver Stations
  • UE User Equipment
  • the calculation load of path detection is significant, so the path detector accounts for a relatively large portion of the reception part.
  • Performing path detection to increase the update frequency (priority) of the user equipment to which a new communication channel is trying to be established is set forth in Japanese Laid-Open Patent Publication No. 2000-151558 .
  • Base Transceiver Stations are also referred to as BTS and User Equipment is also referred to as UE.
  • US 2003/003914 discloses a communication control apparatus in a mobile communication system comprising a speed estimation unit that estimates the relative moving speed of an opposing station, and a modification unit that adjusts the values of apparatus parameters such as a search frequency for a searcher according to an obtained moving speed.
  • US 2004/029547 discloses a radio mobile machine having a profile measurement portion that measures a delay profile of the signal from a base station, a control portion that controls the delay profile measurement portion and changes the measurement period at which a delay profile is measured based on a measured delay spread, and a path detection portion that detects an effective path to the base station based on the measured delay profiles.
  • a reception apparatus adapted to be used by a base station in a wireless communication system includes a path detection unit for performing path detection on a selected user equipment, a deriving unit for dispreading incoming signals from the selected user equipment using the detected path timing, and deriving one or more multipath components, a providing unit for Rake-combining the one or more multipath components to provide a demodulation signal, and a scheduling unit for selecting one or more user equipment at predetermined intervals, then reporting to the path detection unit.
  • the reception apparatus is characterised in that the scheduling unit is arranged to select one or more user equipment according to a combination of a plurality of judgment criteria, wherein the plurality of judgment criteria includes selecting the user equipment with the demodulation signal which has the higher fading frequency.
  • the wireless communication system may be a CDMA-based system.
  • a cellular wireless communication system such as a CDMA-based system
  • the update frequency of path timing required to ensure quality differs for each user equipment.
  • the performance of user equipment comprising mobile terminals and stationary terminals
  • demands from users moving at various speeds are also increasing.
  • the channel status fluctuates by the second, so from the viewpoint of ensuring quality, updating path timing at a higher frequency is preferred.
  • the channel status of users who are not moving at a high rate of speed will change relatively little, so less frequent updating of the path timing is acceptable.
  • the present invention is divided into a few embodiments, but the division of the embodiments herein does not constitute a division of the present invention. Two or more embodiments may be used in combination as necessary.
  • a path detector in base station is used by multiple users in a time-sharing system.
  • the base station has a unit storing for each user the time at which the last path detection was performed then calculating the elapsed time from that time, and a unit measuring the fading frequency of each user.
  • a user with a high fading frequency is believed to be moving at a high rate of speed.
  • the base station has a scheduling unit selecting one or more users for whom path detection will next be performed according to one or more predetermined judgment criteria. The scheduling unit selects the user with the longer elapsed time or the higher fading frequency.
  • One or more of the predetermined judgment criteria may include a criterion wherein the user equipment with the higher Doppler frequency shift is selected. This is because when a carrier frequency offset exceeds a certain level, this frequency shift is believed to be attributed to Doppler frequency shift resulting from a user's high-speed motion. When communication is performed under high visibility conditions, the effect of multipath fading decreases and it may become difficult to discern a user's mobility by the fading frequency alone. Even in such cases, taking the Doppler frequency shift into account makes it possible to gain a firm grasp on the mobility of a user.
  • FIG. 1 shows an antenna 11, a front end unit 12, a path detector 13, a despreading unit 14, and a rake combiner 15.
  • a reference information derivation unit 16 is also shown inside the rake combiner 15.
  • a scheduling unit 17 and a signal processing unit 18 are also shown inside the path detector 13.
  • the front end unit 12 performs, on a wireless reception signal received via the antenna 11, a process such as power amplification, frequency conversion, band limiting, or digital-analog conversion, and outputs a base band signal.
  • the path detector 13 detects the path timing to each user equipment.
  • the despreading unit 14 uses the path timing detected by the path detector 13 and uses the spreading code sequence of each user equipment to despread the reception signal.
  • the despread signal includes multiple multipath components which arrive at different times.
  • the Rake combiner 15 Rake combines the multiple multipath components and prepares the signal for demodulation and decoding.
  • the reference information derivation unit 16 derives the reference information from the rake combined signals.
  • the reference information may express a variety of content like that explained hereinafter.
  • the reference information expresses the fading frequency of the demodulation signal. This fading frequency may be derived by measuring the time cycle at which the demodulation signal fluctuates. Generally, the faster a user moves, the higher the fading frequency.
  • the reference information derivation unit 16 is shown as a part of the rake combiner 15, but the reference information derivation part 16 may be provided separately from the rake combiner 15.
  • the scheduling part 17 outputs scheduling information based on the reference information. Scheduling information specifies which user equipment path should be detected during the next path detection.
  • FIG. 2 shows memory 21, a scheduling evaluation value calculation unit 22, and a user selection unit 23.
  • Memory 21 stores the final selection time for each user equipment.
  • the final selection time corresponds to the previous time when a user equipment was selected for path detection.
  • the elapsed time which is calculated by subtracting the final selection time from the current time, expresses the period during which the path timing has not been updated.
  • the scheduling evaluation value calculation unit 22 calculates the scheduling evaluation value based on the elapsed time and the reference information. As explained below, the scheduling evaluation value can be calculated by a variety of means, but can generally be expressed as the sum of the amount derived from the reference information and the amount derived from the elapsed time. The scheduling evaluation value is calculated for each user equipment.
  • the user selection unit 23 selects M (an integer greater than or equal to 1) user equipment with the smaller scheduling evaluation value based on the scheduling evaluation value provided for each user equipment. Which user equipment is selected is shown by the scheduling information. Regarding the selected user equipment, the final selection time thereof stored in memory 21 is reset to the current time and the elapsed time is reset to 0.
  • the scheduling information is provided at regular intervals or at a regular frequency.
  • the signal processing unit 18 of FIG. 1 detects the path position of the incoming signal from the user equipment which was specified by the scheduling information.
  • FIG. 3 shows a matched filter (MF) 31, a power addition unit 32, and a peak detection unit 33.
  • the matched filter (MF) 31 calculates the correlation value between the spreading code sequence for the specified user equipment and the base band signal.
  • the power addition unit 32 adds the correlation value in phase, then derives the power profile.
  • the peak detection unit 33 detects the peak position which exceeds the threshold in the power profile, then outputs the information which specifies the peak position as the path position or the path timing.
  • the flow chart in FIG. 4 illustrates an example method for preparing the scheduling evaluation value Ck for each of the Nmax number of user equipment.
  • the symbols used in this exemplary operational explanation shall be defined as follows below.
  • step S1 a certain user is selected as the head user. Which user is the head user is not important.
  • step S2 whether or not the scheduling evaluation value was calculated for all users is confirmed. If all calculations are complete, the flow ends, but if users exist for whom the scheduling evaluation value was not calculated, the flow proceeds to step S3.
  • step S3 fading frequency fdk of user k is provided.
  • the fading frequency is obtained from the reference information derivation unit 16 in FIG. 1 as the reference information.
  • Step S4 fading frequency fdk is converted into a certain evaluation value T(fdk).
  • the evaluation value is provided in the format of table T (see FIG. 5 ) according to the fading frequency of the time domain estimated by the reference information derivation unit 16. Also, more or fewer numerical ranges for dividing the fading frequencies and more or fewer corresponding evaluation values can be provided according to the application as can be envisioned by one skilled in the art.
  • the correlation between the fading frequency fdk and the evaluation value T(fdk) can be provided in a table format or can be calculated according to some function on a case-by-case basis.
  • scheduling evaluation value Ck for user k is calculated by combining the evaluation values calculated in step S4 and step S5 according to the following equation.
  • Ck ⁇ T fdk - ⁇ k ⁇ and ⁇ here are the appropriate coupling coefficient or weight coefficient and in the example are set as positive numbers ( ⁇ > 0, ⁇ > 0). Therefore, the scheduling evaluation value is provided to take a smaller value as the fading frequency gets higher and the elapsed time ⁇ k gets longer.
  • the upper M user with a smaller scheduling value is selected by the user selection unit 23, and the path timing is updated.
  • step S7 parameter k which specifies the user is incremented, the flow returns to step S2, then the explained procedure reiterates until scheduling evaluation values are provided for all users.
  • the signal processing unit 18 in FIG. 1 performs path detection on the maximum Mth user at a certain uniform period.
  • the M number of user equipment is specified by the scheduling information.
  • the flow chart in FIG. 6 is used for selecting an M number of users in descending order of Nmax count scheduling evaluation value Ck.
  • the symbols used in this exemplary operational explanation shall be defined as follows below.
  • a certain user is selected as the head user in step SA. In this case as well, which user is the head user is not important.
  • step SB whether or not a size comparison was performed on all scheduling evaluation values Ck is confirmed. If all comparisons are complete, the flow ends, but if all comparisons are not complete, then the flow proceeds to step SM.
  • step SM the size relationship between scheduling evaluation value Ck of user k and scheduling evaluation value DM of the Mth user of the selection order is judged.
  • This DM is a small scheduling evaluation value which was selected by the previous loop or is the scheduling evaluation value which was the Mth smallest value of the M number of scheduling values which were initially selected. If Ck is greater than or equal to DM (Ck ⁇ DM), then there is no way for the user with that scheduling evaluation value to be selected. Therefore, in this case the flow proceeds to step SC, the value of parameter k, which specifies the user, is incremented, and the flow returns to step SB.
  • Ck is less than DM (Ck ⁇ DM)
  • the user with this scheduling evaluation value Ck has a chance of being selected; however, it is certain that the user with scheduling evaluation value DM will be rejected.
  • the scheduling evaluation value of the user with the Mth selection order will be updated to Ck and the user number with the Mth selection order will be updated to k.
  • step SM - 1 the size relationship between scheduling evaluation value Ck of user k and scheduling evaluation value DM - 1 of the user with the M - 1 selection order is judged. If Ck is greater than or equal to DM - 1 (Ck ⁇ DM - 1), it is determined that the order of Ck at the current time is truly the Mth position. Therefore, in this case, the flow proceeds to step SC, the value of parameter k, which specifies the user, is incremented, and returns to step SB.
  • the selection order of that scheduling evaluation value Ck is M - 1 or less (higher than M), and it is determined that the selection order of scheduling evaluation value DM - 1 at the current time has fallen to the Mth position. Then, the content of selection order M and M - 1 is swapped. Specifically, the scheduling evaluation value of the Mth user in the selection order is updated to DM - 1, and the Mth user in the selection order is updated to user number M - 1. Also, the scheduling evaluation value of the user with selection order M - 1 is updated to Ck, and the user number of selection order M - 1 is updated to k.
  • scheduling evaluation value Ck is the lowest value, then the flow reaches step S1, the scheduling evaluation value of the second user in the selection order is updated to D1, and the user number of the second user in the selection order is updated to 1. Also, the scheduling evaluation value of the first user in the selection order is updated to Ck and the user number of the first user in the selection order is updated to k.
  • step SC the value of parameter k, which specifies the user as explained above, is incremented and then the flow proceeds to step SB.
  • the last selection time of the user corresponding to this M number value is updated at the time of the above notification and the last selection time stored in memory 21 is reset. The elapsed time for the M user selected here is reset to 0.
  • the more time required to frequently perform path detection the smaller the value that scheduling evaluation value Ck is determined to take and the lower the order in which the selected upper M user will be selected.
  • a size relationship with reversed numbering can also be set.
  • the more time is required to frequently perform path detection the greater the value that scheduling evaluation value Ck is determined to take and the higher the order in which the selected upper M user will be selected.
  • the operation flow in FIG. 6 is no more than an example, so one skilled in the art may utilize another operational flow which selects an upper M user with a lower value can also be used. Other variations may likewise be used and still be within the principles of the present invention.
  • Carrier frequency offset such as this are caused by shifting of the oscillation frequency in the oscillator which is mounted in the terminal or are caused by the effect of Doppler shift resulting when waves are directly received from a mobile terminal moving at a high rate of speed.
  • the former can be measured to some extent according to the technical standard of the system. If a carrier frequency offset which exceeds an effect such as this occurs, then it could be attributed to the latter Doppler frequency shift effect. In other words, the user is moving at a high rate of speed and path detection must be frequently performed.
  • the Doppler frequency shift appears as a phase variation in the reception signal sample. Therefore, estimating the Doppler frequency shift by using the channel estimation result at the base station is also acceptable.
  • the scheduling evaluation value resulting from the conversion of the estimated value of the carrier frequency offset (Hz) shown in FIG. 7 as additional reference information ⁇ it is acceptable to reflect in the scheduling evaluation value the fact that the path detection priority of the user for whom a carrier frequency offset greater than a certain amount is occurring should be increased.
  • the reception signal quality of signals from a user moving at a high rate of speed tends to vary greatly due to fading of the reception SIGNAL-INTERFERENCE-RATIO (SIR), for example.
  • SIR reception SIGNAL-INTERFERENCE-RATIO
  • Variation can also be expressed as variance, standard deviation, or deviation, for example.
  • the variance of the reception SIR shown in FIG. 8 is tempered as additional reference information gamma which is the value converted into the scheduling evaluation value, it is acceptable to reflect in the scheduling evaluation value the fact that the path detection priority of the user for whom variation in the reception SIR is increasing, due to a high rate of motion, should be increased.
  • Reception signal quality can also be expressed as, for example, SIR (Signal-to-Interference power Ratio), SINR (Signal-to-Interference plus Noise power Ratio), CNR (Carrier-to-Interference power Ratio), or BLER (BLock Error Rate).
  • SIR Signal-to-Interference power Ratio
  • SINR Signal-to-Interference plus Noise power Ratio
  • CNR Carrier-to-Interference power Ratio
  • BLER Battery Error Rate
  • a decoder 91 is added to the elements already explained in FIG. 1 .
  • the decoder 91 decodes rake combined demodulation signals, calculates BLER, then reports the reception BLER to the scheduling unit 17.
  • the scheduling unit 17 compares the reported reception BLER to the target BLER, judges the degree of deviation from the desired value, then reflects the judgment result in the scheduling evaluation value. Similar to when the reception SIR is used, the scaling unit 17 compares the reported reception SIR to the target SIR, judges the degree of deviation from the desired value, then reflects the judgment result in the scheduling evaluation value.
  • a user's path detection frequency was relatively regulated according to the communication conditions, but setting an absolutely high priority to particular communicating parties such as police stations, fire stations, and hospitals is also acceptable. Preventing disrupted communication caused by variation in the path timing from occurring by increasing the priority of path detection for users with whom such important communication is performed is preferred in certain exemplary embodiments.
  • a variety of communication such as audio communication and data communication can be performed by a user.
  • High-quality transmission of audio packets or real-time data is preferred. Therefore, increasing the path detection priority of users for whom such real-time communication is imperative is preferred in certain exemplary embodiments.
  • Base stations measure the RTT (Round Trip Time) for each user either periodically or as necessary to grasp the distance to the user. Measurements such as these are important data which is necessary to provide service, so quickly and precisely taking these measurements is preferred. Therefore, increasing the path detection priority of such users who are measured is preferred in certain exemplary embodiments.
  • the present invention was divided into a few embodiments, but the division of the embodiments herein does not constitute a division of the present invention.
  • One or more embodiments may be used as necessary. More numerical ranges for dividing the Doppler frequency, carrier frequency offset, and reception SIR variance and more corresponding evaluation values can also be provided.
  • moderation of the update frequency of path timing for each user equipment used when rake combining is performed at a CDMA system base station is possible.
  • some or all of the method components are implemented as a computer executable code.
  • a computer executable code contains a plurality of computer instructions that when performed by a computer result in the execution of the tasks disclosed herein.
  • the computer executable code (or program) may be stored on a recording medium.
  • a computer-readable recording medium may be provided storing therein a computer program for implementing a method for detecting path timing in a Code Division Multiple Access (CDMA) system base station.
  • CDMA Code Division Multiple Access
  • the computer program causes a computer to execute a path detection on selected user equipment; despreading incoming signals from the selected user equipment by using the detected path timing, and deriving one or more multipath components from the despread incoming signals; rake combining the one or more multipath components, and providing a demodulation signal; and selecting one or more user equipment at predetermined intervals according to one or more judgment criteria.
  • the one or more judgment criteria including criteria for selecting user equipment having the demodulation signal with a higher fading frequency.
  • the computer executable code may be available as source code or in object code, and may be further comprised as part of, for example, a portable memory device or downloaded from the Internet, or embodied on a program storage unit or computer readable medium.
  • the computer executable code may be uploaded to, and executed by, a machine comprising any suitable architecture.
  • the machine is implemented on a computer platform having hardware such as one or more central processing units ("CPU"), a random access memory (“RAM”), and input/output interfaces.
  • CPU central processing units
  • RAM random access memory
  • the computer platform may also include an operating system and microinstruction code.
  • the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU, whether or not such computer or processor is explicitly shown.
  • various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.
  • base station Since in some wireless communication systems the functions of a base station are to some extent replicated in relay stations or in peer-to-peer nodes of the system, the term "base station” as employed in the description and claims is to be interpreted broadly to include such relay stations and nodes which may, for example, be constituted by user equipments (UEs) in some instances.
  • UEs user equipments

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Claims (12)

  1. Appareil de réception adapté pour être utilisé par une station de base dans un système de communication sans fil, ledit appareil de réception comprenant :
    une unité de détection de trajet (13) pour effectuer une détection de trajet sur un équipement d'utilisateur sélectionné ;
    une unité de dérivation (14) pour désétaler des signaux entrants provenant dudit équipement d'utilisateur sélectionné en utilisant la temporisation du trajet détecté, et la dérivation d'un ou plusieurs composants à trajets multiples ;
    une unité de transmission (15) pour une combinaison Rake desdits un ou plusieurs composants à trajets multiples pour générer un signal de démodulation ; et la planification d'une unité (17) pour sélectionner à des intervalles prédéterminés un ou plusieurs équipements d'utilisateur, puis rapporter à ladite unité de détection de trajet ; caractérisé en ce que :
    ladite unité de planification (17) est configurée pour déterminer une valeur d'évaluation de planification (Ck) pour chaque équipement d'utilisateur en additionnant conjointement des valeurs d'évaluation obtenues pour chacun d'une pluralité de critères de jugement prédéterminés de l'équipement d'utilisateur respectif, ladite pluralité de critères de jugement prédéterminés comprenant une fréquence d'évanouissement (fdk) d'un signal de démodulation de l'équipement d'utilisateur respectif et le temps écoulé (τk) depuis la détection précédente de trajet de l'équipement d'utilisateur respectif, et pour sélectionner l'un ou plusieurs équipements d'utilisateur selon une comparaison de la valeur d'évaluation de planification déterminée (Ck) de chaque équipement d'utilisateur, dans lequel, dans la détermination de la valeur d'évaluation de planification (Ck), l'unité de planification (17) est configurée pour multiplier les valeurs d'évaluation respectives (T(fdk), τk) pour la fréquence d'évanouissement (fdk) et le temps écoulé (τk) par des coefficients de pondération respectifs (α, β) avant d'additionner conjointement les produits respectifs.
  2. Appareil de réception selon la revendication 1 dans lequel ladite pluralité de critères de jugement prédéterminés comprend le déplacement de fréquence Doppler d'un équipement d'utilisateur.
  3. Appareil de réception selon la revendication 1 ou 2 dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend la qualité de réception d'un signal entrant d'un équipement d'utilisateur.
  4. Appareil de réception selon l'une quelconque des revendications précédentes dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend le déplacement par rapport à une valeur souhaitée de la qualité de réception d'un signal entrant d'un équipement d'utilisateur.
  5. Appareil de réception selon la revendication 4, dans lequel ladite qualité de réception est exprimée sous la forme d'un taux d'erreur sur les blocs.
  6. Appareil de réception selon la revendication 4, dans lequel ladite qualité de réception est exprimée sous la forme d'un rapport de la puissance de signal souhaitée du signal de réception à la puissance de signal souhaitée.
  7. Appareil de réception selon l'une quelconque des revendications précédentes, dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend la détermination si un équipement d'utilisateur est désynchronisé.
  8. Appareil de réception selon l'une quelconque des revendications précédentes, dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend la détermination si un équipement d'utilisateur communique avec une partie prédéterminée dans le système.
  9. Appareil de réception selon l'une quelconque des revendications précédentes, dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend la détermination si un équipement d'utilisateur communique en utilisant des paquets audio.
  10. Appareil de réception selon l'une quelconque des revendications précédentes, dans lequel
    ladite pluralité de critères de jugement prédéterminés comprend la détermination si un équipement d'utilisateur sera utilisé pour mesurer la durée de rotation (RTT).
  11. Procédé de détection de trajet utilisé par une station de base d'un système de communication sans fil, ledit procédé comprenant :
    l'exécution d'une détection de trajet sur l'équipement d'utilisateur sélectionné ;
    le désétalement de signaux entrants provenant dudit équipement d'utilisateur sélectionné en utilisant la temporisation de trajet détectée, et la dérivation d'un ou plusieurs composants à trajets multiples ;
    la combinaison Rake desdits un ou plusieurs composants à trajets multiples, et la transmission d'un signal de démodulation ; et
    la sélection à des intervalles prédéterminés d'un ou plusieurs équipements d'utilisateur,
    caractérisé en ce que :
    ladite étape de sélection comprend la détermination d'une valeur d'évaluation de planification (Ck) pour chaque équipement d'utilisateur en additionnant conjointement des valeurs d'évaluation obtenues pour chacun d'une pluralité de critères de jugement de l'équipement d'utilisateur respectif, ladite pluralité de critères de jugement comprenant une fréquence d'évanouissement (fdk) d'un signal de démodulation de l'équipement d'utilisateur respectif et le temps écoulé (τk) depuis la détection de trajet précédente de l'équipement d'utilisateur respectif, et la sélection d'un ou plusieurs équipements d'utilisateur selon une comparaison de la valeur d'évaluation de planification déterminée (Ck) de chaque équipement d'utilisateur, dans lequel, dans la détermination de la valeur d'évaluation de planification (Ck), les valeurs d'évaluation respectives (T(fdk), τk) pour la fréquence d'évanouissement (fdk) et le temps écoulé (τk) sont multipliées par des coefficients de pondération respectifs (α, β) avant d'être additionnées conjointement.
  12. Programme informatique pour mettre en oeuvre un procédé pour détecter la temporisation de trajet dans une station de base, ledit programme informatique amenant un processeur de la station de base à exécuter :
    la détection de trajet sur un équipement d'utilisateur sélectionné ;
    le désétalement de signaux entrants provenant dudit équipement d'utilisateur sélectionné en utilisant la temporisation de trajet détectée, et la dérivation d'un ou plusieurs composants à trajets multiples ;
    la combinaison Rake desdits un ou plusieurs composants à trajets multiples, et la génération d'un signal de démodulation ; et
    la sélection à des intervalles prédéterminés d'un ou plusieurs équipements d'utilisateur,
    caractérisé en ce que :
    ladite étape de sélection comprend la détermination d'une valeur d'évaluation de planification (Ck) pour chaque équipement d'utilisateur en additionnant conjointement des valeurs d'évaluation obtenues pour chacun d'une pluralité de critères de jugement de l'équipement d'utilisateur respectif, ladite pluralité de critères de jugement comprenant une fréquence d'évanouissement (fdk) d'un signal de démodulation de l'équipement d'utilisateur respectif et le temps écoulé (τk) depuis la détection de trajet précédente de l'équipement d'utilisateur respectif, et la sélection des un ou plusieurs équipements d'utilisateur selon une comparaison de la valeur d'évaluation de planification déterminée (Ck) de chaque équipement d'utilisateur, dans lequel, dans la détermination de la valeur d'évaluation de planification (Ck), les valeurs d'évaluation respectives (T(fdk), τk) pour la fréquence d'évanouissement (fdk) et le temps écoulé (τk) sont multipliées par des coefficients de pondération prédéterminés respectifs (α, β) avant d'être additionnées conjointement.
EP20080101954 2007-02-26 2008-02-25 Appareil de réception, appareil de détection de trajet, procédé associé, et programme utilisé dans une station de base Expired - Fee Related EP1962434B1 (fr)

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JP2007045551A JP4836829B2 (ja) 2007-02-26 2007-02-26 Ｃｄｍａ方式の基地局で使用される受信装置、パス検出装置、方法及びコンピュータプログラム

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EP1962434B1 true EP1962434B1 (fr) 2012-05-30

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US8423066B2 (en) 2010-02-23 2013-04-16 Research In Motion Limited Method and apparatus for opportunistic communication scheduling in a wireless communication network using motion information
EP2362706B1 (fr) * 2010-02-23 2013-10-09 BlackBerry Limited Procédé et appareil de programmation de communication opportuniste dans un réseau de communication sans fil utilisant des informations de mouvement
JP2013074435A (ja) * 2011-09-27 2013-04-22 Sharp Corp 受信装置、受信方法および受信プログラム
US10992336B2 (en) * 2018-09-18 2021-04-27 Roku, Inc. Identifying audio characteristics of a room using a spread code

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JP2856198B2 (ja) * 1997-06-11 1999-02-10 日本電気株式会社 スペクトラム拡散受信機
JP3913879B2 (ja) * 1998-02-03 2007-05-09 富士通株式会社 移動速度に基づく通信制御装置および方法
JP3741881B2 (ja) 1998-11-16 2006-02-01 富士通株式会社 Ｃｄｍａ通信において使用される受信装置
JP3876403B2 (ja) * 2000-06-15 2007-01-31 富士通株式会社 フェージング周波数推定回路及び該回路を備えたｃｄｍａ受信装置
JP2002204181A (ja) * 2000-12-28 2002-07-19 Toshiba Corp 移動無線端末
JP3551152B2 (ja) * 2001-01-23 2004-08-04 日本電気株式会社 パス検出装置及び方法
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JP2008211465A (ja) 2008-09-11
EP1962434A1 (fr) 2008-08-27
JP4836829B2 (ja) 2011-12-14
US8811368B2 (en) 2014-08-19

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